| 摘要 |
A directional coupling device includes a main line and a sub line, and line coupling (distributed constant coupling) is effected between the main line and the sub line, each of which has a portion that is arranged substantially parallel to each other and alongside each other. The sub line is longer than the main line. The main line is a substantially straight line or a substantially straight line bending at a predetermined position, i.e., a non-spiraling line, and the sub line is arranged to circle in a spiral manner by bending a substantially straight line at predetermined positions. Thus, a small high-capability directional coupler has excellent isolation properties and directivity, and little insertion loss or deterioration in reflection properties.
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